<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .box{
            border-top: .2em solid transparent;
            border-image: 100% 0 0 linear-gradient(90deg,
                            currentColor 4em,
                            transparent 0);
                            padding-top: 1em;
                            color: rebeccapurple;
        }
    </style>
</head>
<body>
    <div class="box">border-clip</div>
</body>
</html>